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在分析水文地质条件和建立黄河下游(河南段)影响带数学模型的基础上,采用FEFLOW软件建立了三维地下水流模拟模型。详细描述了模型中截渗墙的处理,并用模型模拟了截渗墙建成后黄河侧渗量和地下水流场的变化。结果为截渗墙埋深为20m和45m时,黄河年间侧渗量减少率相应为5.50%和7.48%,影响范围位于大堤两侧10km以内。地下水位的变化表现为大堤内侧水位相应升高,大堤外侧水位相应下降。
Based on the analysis of hydrogeological conditions and the establishment of the mathematical model of influence zone in the lower reaches of the Yellow River (Henan section), a three-dimensional groundwater flow simulation model was established by using FEFLOW software. The treatment of cutoff wall in the model is described in detail, and the model is used to simulate the change of lateral infiltration and groundwater flow after the cutoff wall is built. The results show that when the depth of cutoff wall is 20m and 45m, the decrease rates of the infiltration rate in the Yellow River are 5.50% and 7.48% respectively, and the influence range is within 10km on both sides of the embankment. The change of groundwater level shows that the water level inside the embankment rises correspondingly and the water level outside the embankment decreases accordingly.